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Berakhot 3:6: A Zav [someone subject to a certain form of ritual impurity] who saw a seminal emission, and a Niddah [someone subject to a different form of ritual impurity] who discharged semen from sexual relations, and a woman having sexual relations who saw menstrual blood, require [ritual] immersion. And Rabbi Yehudah exempts them.

Berakhot 4:1: Shacharit [can be said] until midday. Rabbi Yehudah says until four hours into the day. Minchah [can be said] until the evening. Rabbi Yehudah says until the middle of the afternoon. Ma’ariv has no set time and Musaf can be said all day. Rabbi Yehudah says until seven hours into the day.